Drop Optimize-GameRules-to-use-LinkedHashMap (#2594)

Mojang has since replicated the logic

Spigot-Server-Patches/Optimize-GameRules-to-use-LinkedHashMap.patch

@@ -1,23 +0,0 @@
-From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
-From: Spottedleaf <Spottedleaf@users.noreply.github.com>
-Date: Thu, 4 Apr 2019 17:55:05 -0700
-Subject: [PATCH] Optimize GameRules to use LinkedHashMap
-
-Previously TreeMap was used which has poor get(K) performance.
-
-diff --git a/src/main/java/net/minecraft/server/GameRules.java b/src/main/java/net/minecraft/server/GameRules.java
-index 45d5675adf..58b3d0ec93 100644
---- a/src/main/java/net/minecraft/server/GameRules.java
-+++ b/src/main/java/net/minecraft/server/GameRules.java
-@@ -0,0 +0,0 @@ import org.apache.logging.log4j.Logger;
- public class GameRules {
- 
-     private static final Logger LOGGER = LogManager.getLogger();
--    private static final Map<GameRules.GameRuleKey<?>, GameRules.GameRuleDefinition<?>> z = Maps.newTreeMap(Comparator.comparing((gamerules_gamerulekey) -> {
--        return gamerules_gamerulekey.a;
--    }));
-+    private static final Map<GameRules.GameRuleKey<?>, GameRules.GameRuleDefinition<?>> z = Maps.newLinkedHashMap(); // Paper
-     public static final GameRules.GameRuleKey<GameRules.GameRuleBoolean> DO_FIRE_TICK = a("doFireTick", GameRules.GameRuleBoolean.b(true));
-     public static final GameRules.GameRuleKey<GameRules.GameRuleBoolean> MOB_GRIEFING = a("mobGriefing", GameRules.GameRuleBoolean.b(true));
-     public static final GameRules.GameRuleKey<GameRules.GameRuleBoolean> KEEP_INVENTORY = a("keepInventory", GameRules.GameRuleBoolean.b(false));
---